Stainless Steel ER630-A vs ER630-H1025
Stainless Steel · ER630 temper comparison
ER630-A and ER630-H1025 are two conditions of the same stainless steel grade, ER630: A (solution annealed) versus H1025 (aged 552 °C (1025 °F) for 4 h). The chemistry is identical, so every difference below comes from the condition. ER630-H1025 is the stronger of the two: yield strength 1,000 MPa (145 ksi) against 760 MPa (110 ksi) for ER630-A, about 32% more. ER630-H1025 is harder — 352 HB against 320 HB for ER630-A — which matters for wear surfaces and threads. ER630-H1025 runs hotter in service (340°C vs 300°C continuous) and ER630-H1025 conducts heat better (18.3 W/m·K vs 16.3 W/m·K). On the shop floor, ER630-A welds better (very good vs good) and ER630-A forms better (30 vs 15 out of 100).
ER630-AChoose it when it will be welded.
ER630-H1025Choose it when strength drives the design, or when surface hardness matters.
ER630-A vs ER630-H1025: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 197 GPa28.6 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.27 · Reduction in Area 45%
Physical
Density and transition temperatures.
Same in both: Density 7.78 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,404°C2,559 °F · Liquidus Temperature 1,440°C2,624 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.8 µm/m·K6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -70°C-94 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 53 MJ/kg22,786 BTU/lb · Embodied Carbon (primary production) 5 kg CO₂/kg · Embodied Water 180 L/kg21.6 gal/lb · Typical Recycled Content 50%
Strength versus weight
Yield strength against density for every stainless steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
ER630-A vs ER630-H1025 — frequently asked
Is ER630-H1025 stronger than ER630-A?
Yes. ER630-H1025 has a typical yield strength of 1,000 MPa (145 ksi) against 760 MPa (110 ksi) for ER630-A — about 32% more. Tensile strength is 1,070 MPa (155 ksi) vs 1,030 MPa (149 ksi).
Which condition does FabDigit quote by default, A or H1025?
AW is the default ER630 condition in the FabDigit quote flow (neither A nor H1025). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which welds better, ER630-A or ER630-H1025?
ER630-A. Its weldability rates very good (80/100) against good (60/100) for ER630-H1025.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ER630-A and ER630-H1025 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.